/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.geode.internal.statistics;

/**
 * Describes the contract a VMStats implementation must implement.
 * <p> I named this VMStatsContract because an implementation named
 *     VMStats already exists and I didn't want to rename it because
 *     of the svn merge issues.
 * @see VMStatsContractFactory
 */
public interface VMStatsContract {
  /**
   * Called by sampler when it wants the VMStats statistics values to be
   * refetched from the system.
   */
  public void refresh();
  /**
   * Called by sampler when it wants the VMStats to go away.
   */
  public void close();
}
